#13 – Children have about 70 bones more than adults have

Newborns usually have about 270 bones, most of which are very small. This makes bones more flexible and helps the child to pass through the birth canal and to grow rapidly. As they get older, many of these bones are fused. Adult’s skeleton has in average 200-213 bones.

#12 – The Eiffel Tower rises 15 centimeters in the summer

The huge structure built with expansion joints, through which steel can expand and contract without any damage.When the steel is heated, it begins to expand and take up more volume. This is called thermal expansion. Conversely, a drop in temperature leads to decrease of structure volume.

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#11 – 20% of the oxygen produced in the Amazon rainforest

Amazon rainforest occupies 5.5 million square kilometers. Amazon jungle produce a substantial portion of the oxygen on Earth by absorbing huge amounts of carbon dioxide, so it’s often called the lungs of the planet.

#10 – Some metals are so chemically active that they explode even in contact with water

Some metals and compounds - Potassium, Sodium, Lithium, Rubidium, and Cesium - exhibit increased reactivity, thus they capable to fire at once in contact with air, and if you omit them into water - they can even explode.

#9 – A teaspoon of a neutron star would weigh 6 billion tons

Neutron stars are the remnants of massive stars, consisting mainly of the neutron core, covered with a relatively thin (about 1 km) crust material in the form of heavy atomic nucleuses and electrons. The cores of stars who died during the explosion of the supernova star, compressed under the influence of gravity. So superdense neutron stars are formed in a such manner. The astronomers found that the mass of neutron stars can be compared with the mass of the Sun, despite the fact that their radiuses do not exceed 10-20 kilometers.